include: replace unifdef-y with header-y

unifdef-y and header-y has same semantic.
So there is no need to have both.

Drop the unifdef-y variant and sort all lines again

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/include/video/Kbuild b/include/video/Kbuild
index 0e406f7..ad3e622 100644
--- a/include/video/Kbuild
+++ b/include/video/Kbuild
@@ -1,2 +1,3 @@
-unifdef-y += sisfb.h uvesafb.h
-unifdef-y += edid.h
+header-y += edid.h
+header-y += sisfb.h
+header-y += uvesafb.h